Improvement in the methods of securing letters to stone



JJVENNALL.

Me-thgds of Scuring Leiters to Stone. N0.142,;421.PatentedSeptember2,1873.

"wl'l'nesses, JnY/enfm;

JOHN VENNALL, OF BOSTON, MASSACHUSETTS.

. IMPROVEMENT IN THE METHODS OF SECURING LETTERS TO STQNE.

Specification forming part of Letters Patent No. 142,421, datedSeptember '2 1873 application filed March 21, 1873.

To all whom it may concern:

Be it known that I, JOHN VENNALL, of Boston, in the county of Suffolkand State of Massachusetts, have invented an Improved Method of SecuringLetters to Marble and Stone Surfaces; and I do hereby declare that thefollowing is a full and exact description thereof, reference being hadto the accompanying drawings making part of this specification Figurelbeing a View of a portion of a marble slab, showing my improved mode oflettering the same; Figs. 2 and 3, sections in the lines w 00 and g; y,Fig. 1.

Like letters designate corresponding parts in all of the figures.

My invention consists in the mode of securin g letters of metal, orother equivalent material of a plastic nature, into recesses'or cavitiesof -the same form cut into the marble or stone, by first drillingoblique holes in the bottoms of the cavities and then driving theletters into the cavities by the blows of a mallet or hammer until themetal of the letters is caused to fill the oblique holes, therebyretaining the letter-blocks against coming out, .without the applicationof considerable extracting force. The outer surface of the letters isthen worked off and finished in any desired manner.

In the drawings, A A represent the metallic letters, generally of leador an alloy containing lead, so as to give it sufficient plasticity forthe purpose. These letters are stamped or other- Wise formed in shape.Cavities B B are then cut in the marble surface deep enough to receivethe desired thickness of letters. Then a sufficient number of obliqueholes, a a, are bored or drilled in the marble or stone below the bottomof the cavities, substantially as shown in Figs. 2 and 3, the number ofholes to be sufficient to securely retain the letters in the cavities.The lettersAA are then inserted in their corresponding cavities anddriven in with a mallet or hammer with snfficient force to cause themetal of the letters to be forced into the holes a a, by the plasticitythereof. The surface of the letters is then trimmed away flush with thesurface of the marble or stone and gilded or otherwise finished to suitthe taste. They cannot then be removed without the application ofconsiderable force, for the reason that the metal in the holes cannotdraw out directly.

What I claim as my invention, and desire to secure by Letters Patent, is

The method of securing letters to marble or stone surfaces by makingthem of a plastic metal or material and driving theminto correspondingcavities in the marble, so as to fill oblique holes in the bottomsthereof, substantially as and for the purpose herein specified.

- JOHN VENNALL.

Witnesses:

ELISHA BASSETT, THOMAS PALMER Hronus.

FIGE.

